Strong nonreciprocity for transverse electric and dual-polarization wave with all dielectric structure.

The enhanced nonreciprocity for transverse electric wave (TE) and dual-polarization light is investigated. The device is composed of a cascaded dielectric-Weyl semimetal film sandwiched between a high contrast grating and a dielectric substrate. The results indicate that near-complete nonreciprocity can be observed for TE wave for light under conical incidence, which is attributed to the guided mode resonance (GMR) excited by the high contrast grating demonstrating by analyzing the normalized electric field intensity distribution. Further, impedance matching condition has also been employed to confirm the underlying physical origin. In addition, the strong nonreciprocal radiation properties could be remained stably insides a broad geometrical parameter range. More importantly, the structure can be expanded to realize dual-polarization nonreciprocal radiation for both TE- and TM-polarized wave. The concepts and conclusions obtained here will be interesting for the developing of novel polarization-dependent and dual-polarization nonreciprocal radiation devices. [ABSTRACT FROM AUTHOR]